Several N-(4-phenoxyphenyl)pyridinecarboxamides and N-(4-phenoxyphenyl)pyrazinecarboxamides were synthesized from commercially available material, and their ovicidal activities against Cydia pomonella (L.) were tested. Some of the tested products showed a moderate activity when <24-h-old eggs were sprayed using a Potter tower. A significant increase in the length of the development also observed in many cases. A clear correlation between both effects was period of the eggs was noticed: the products that produced higher mortality also produced higher increase of the length of the development. These results seem to confirm our hypothesis that these compounds could be defined as a juvenile hormone analogues.
Ovicidal, larvicidal and juvenilizing activity of a picolinephenoxyanilide againstCydia pomonella
N-(4-phenoxyphenyl)-2-pyridinecarboxamide (1) was synthesized from commercially available materials and its ovicidal and larvicidal activity against Cydia pomonella (L) was tested. The compound showed a LC50 of 0.98 mg ml(-1) when eggs less than 24h were sprayed using a Potter Tower, but it had no effect when eggs older than this were sprayed. The compound did not have larvicidal activity when larvae were treated with 1200 mu g g(-1). However, the larval head capsules were smaller than those in the controls when treated at this concentration. To assess its possible juvenile-hormone-like activity, the compound was topically applied to young pupae of Tribolium confusum duVal, where it produced clear juvenilization effects, which were dependent on the applied dose. (C) 2000 Society of Chemical Industry.